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Note 1 - Organization
 12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
1.
ORGANIZATION:
 
Northwest Pipe Company (collectively with its subsidiaries, the “Company”) produces engineered pipeline systems including steel pipe, reinforced concrete pipe, and protective linings. These pipeline systems are primarily used in water infrastructure including drinking water systems, hydroelectric power systems, wastewater systems, industrial plant piping systems, certain structural applications, and other applications. The Company’s chief operating decision maker, its Chief Executive Officer, evaluates performance of the Company and makes decisions regarding allocation of resources based on total Company results. Therefore, the Company has determined that it operates in
one
segment, Water Infrastructure. The Company has manufacturing facilities located in Portland, Oregon; Adelanto, California; Saginaw, Texas; Tracy, California; Parkersburg, West Virginia; St. Louis, Missouri; and San Luis Río Colorado, Mexico.